/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.envers.configuration.metadata;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.envers.configuration.GlobalConfiguration;
import org.hibernate.envers.configuration.AuditEntitiesConfiguration;
import org.hibernate.envers.entities.mapper.relation.MiddleComponentData;
import org.hibernate.envers.entities.mapper.relation.MiddleIdData;
import org.hibernate.envers.entities.mapper.relation.query.OneEntityQueryGenerator;
import org.hibernate.envers.entities.mapper.relation.query.RelationQueryGenerator;
import org.hibernate.envers.entities.mapper.relation.query.ThreeEntityQueryGenerator;
import org.hibernate.envers.entities.mapper.relation.query.TwoEntityQueryGenerator;
/**
* Builds query generators, for reading collection middle tables, along with any related entities.
* The related entities information can be added gradually, and when complete, the query generator can be built.
* @author Adam Warski (adam at warski dot org)
*/
public final class QueryGeneratorBuilder {
private final GlobalConfiguration globalCfg;
private final AuditEntitiesConfiguration verEntCfg;
private final MiddleIdData referencingIdData;
private final String auditMiddleEntityName;
private final List<MiddleIdData> idDatas;
QueryGeneratorBuilder(GlobalConfiguration globalCfg, AuditEntitiesConfiguration verEntCfg,
MiddleIdData referencingIdData, String auditMiddleEntityName) {
this.globalCfg = globalCfg;
this.verEntCfg = verEntCfg;
this.referencingIdData = referencingIdData;
this.auditMiddleEntityName = auditMiddleEntityName;
idDatas = new ArrayList<MiddleIdData>();
}
void addRelation(MiddleIdData idData) {
idDatas.add(idData);
}
RelationQueryGenerator build(MiddleComponentData... componentDatas) {
if (idDatas.size() == 0) {
return new OneEntityQueryGenerator(verEntCfg, auditMiddleEntityName, referencingIdData,
componentDatas);
} else if (idDatas.size() == 1) {
return new TwoEntityQueryGenerator(globalCfg, verEntCfg, auditMiddleEntityName, referencingIdData,
idDatas.get(0), componentDatas);
} else if (idDatas.size() == 2) {
return new ThreeEntityQueryGenerator(globalCfg, verEntCfg, auditMiddleEntityName, referencingIdData,
idDatas.get(0), idDatas.get(1), componentDatas);
} else {
throw new IllegalStateException("Illegal number of related entities.");
}
}
/**
* @return Current index of data in the array, which will be the element of a list, returned when executing a query
* generated by the built query generator.
*/
int getCurrentIndex() {
return idDatas.size();
}
}